Ellie is determined to save Hotel Silver, the struggling hotel she inherited from her father. On a storm-ravaged night, the hotel unexpectedly fills with a group of mysterious guests, each with their own shadowy past. As the night unfolds, Ellie becomes entangled in a web of secrets, lies, and sinister motives.

Five years after the defeat of Bill Cipher, Mabel and Dipper Pines prepares their 18th birthday party. But when Robbie Valentino and his friends break into Ford's inventory of anomalies, a dark force from the past awakens.